THANK YOU GURKE

solutions/04-b.ts

@@ -6,13 +6,12 @@ import { readInput } from "../utils.ts";
 class DayFour implements Solvable {
     input = readInput('04')
 
+    matrix: string[][] = this.input.trim().split('\n').map(line => line.split(''))
+
     public part1(): Solvable {
+        const matrix = this.matrix
 
-        const transpose = (m: string[][]) => m[0].map((_, i) => m.map(x => x[i]))
+        const lookAround = (x: number, y: number) => {
-
-        const matrix = this.input.trim().split('\n').map(line => line.split(''))
-
-        function lookAround(x: number, y: number) {
             const allowed = {
                 top: y >= 3,
                 bottom: y <= matrix.length - 4,
@@ -77,6 +76,45 @@ class DayFour implements Solvable {
     }
 
     public part2(): Solvable {
+        const matrix = this.matrix
+
+        const checkMas = (x: number, y: number): boolean => {
+            const allowed = (
+                y >= 1 &&
+                y <= matrix.length - 2 &&
+                x >= 1 &&
+                x <= matrix.length - 2
+            )
+
+            if (allowed) {
+                return (
+                    (
+                        matrix[y - 1][x - 1] === 'M' &&
+                        matrix[y + 1][x + 1] === 'S' ||
+                        matrix[y - 1][x - 1] === 'S' &&
+                        matrix[y + 1][x + 1] === 'M'
+                    )
+                    &&
+                    (
+                        matrix[y - 1][x + 1] === 'M' &&
+                        matrix[y + 1][x - 1] === 'S' ||
+                        matrix[y - 1][x + 1] === 'S' &&
+                        matrix[y + 1][x - 1] === 'M'
+                    )
+                )
+            }
+            return false
+        }
+
+        let amountOfMatches = 0
+        for (let y = 0; y < matrix.length; y++) {
+            for (let x = 0; x < matrix.length; x++) {
+                if (matrix[y][x] === 'A')
+                    if (checkMas(x, y)) amountOfMatches += 1
+            }
+        }
+
+        console.log(amountOfMatches)
         return this
     }
 }